(OK, I'm being deliberately provocative, but my argument stands. Which moral principle should we use for deciding which organism has which rights, and why?)
There are several passages in the Bible that have direct bearing on the abortion issue, specifically dealing with the crime of killing the unborn child, and generally to the "pro-choice" battle and principals of life and death.
Here we go (from
here):
Abortion for Incest:
“Fathers shall not be put to death for their children, nor shall children be put to death for their fathers; a person shall be put to death for his own sin. - Deuteronomy 24:16
http://www.biblegateway.com/passage/?search=Deuteronomy24:16&version=NKJV
Abortion for Rape:
Do not “do evil that good may come” - Romans 3:8
http://www.biblegateway.com/passage/?search=Romans3:8&version=NKJV
The soul who sins shall die. The son shall not bear the guilt of the father, nor the father bear the guilt of the son. The righteousness of the righteous shall be upon himself, and the wickedness of the wicked shall be upon himself. - Ezekiel 18:20
http://www.biblegateway.com/passage/?search=Ezekiel18:20&version=NKJV
(These verses also apply to abortion for incest and all punishment of the child for the crime of the father.)
The Baby in the Womb is Called a Child:
“Behold, the virgin shall be with child, and bear a Son, and they shall call His name Immanuel,” which is translated, “God with us.” - Matthew 1:23
http://www.biblegateway.com/passage/?search=Matthew1:23&version=NKJV
But the children struggled together within her; and she said, “If all is well, why am I like this?” So she went to inquire of the Lord. - Genesis 25:22
http://www.biblegateway.com/passage/?search=Genesis25:22&version=NKJV
And He said to me, ‘Behold, you shall conceive and bear a son. Now drink no wine or similar drink, nor eat anything unclean, for the child shall be a Nazirite to God from the womb to the day of his death.’” - Judges 13:7
http://www.biblegateway.com/passage/?search=Judges13:7&version=NKJV
“If men fight, and hurt a woman with child, so that she gives birth prematurely, yet no harm follows, he shall surely be punished accordingly as the woman’s husband imposes on him; and he shall pay as the judges determine.But if any harm follows, then you shall give life for life,eye for eye, tooth for tooth, hand for hand, foot for foot,burn for burn, wound for wound, stripe for stripe. - Exodus 21:22-25
http://www.biblegateway.com/passage/?search=Exodus21:22-25&version=NKJV
For he will be great in the sight of the Lord, and shall drink neither wine nor strong drink. He will also be filled with the Holy Spirit, even from his mother’s womb.And it happened, when Elizabeth heard the greeting of Mary, that the babe leaped in her womb; and Elizabeth was filled with the Holy Spirit. - Luke 1:15,41
http://www.biblegateway.com/passage/?search=Luke1:15,41&version=NKJV
“Before I formed you in the womb I knew you; Before you were born I sanctified you; I ordained you a prophet to the nations.” - Jeremiah 1:5
http://www.biblegateway.com/passage/?search=Jeremiah1:5&version=NKJV
Crime of Killing the Innocent:
Keep yourself far from a false matter; do not kill the innocent and righteous. For I will not justify the wicked. - Exodus 23:7
http://www.biblegateway.com/passage/?search=Exodus23:7&version=NKJV
‘Cursed is the one who takes a bribe to slay an innocent person.’ “And all the people shall say, ‘Amen!’ - Deuteronomy 27:25
http://www.biblegateway.com/passage/?search=Deuteronomy27:25&version=NKJV
Also on your skirts is found The blood of the lives of the poor innocents. I have not found it by secret search, But plainly on all these things.Yet you say, ‘Because I am innocent, Surely His anger shall turn from me.’ Behold, I will plead My case against you, Because you say, ‘I have not sinned.’ - Jeremiah 2:34-35
http://www.biblegateway.com/passage/?search=Jeremiah2:34-35&version=NKJV
“Yet your eyes and your heart are for nothing but your covetousness, For shedding innocent blood, And practicing oppression and violence.” - Jeremiah 22:17
http://www.biblegateway.com/passage/?search=Jeremiah22:17&version=NKJV
For they have committed adultery, and blood is on their hands. They have committed adultery with their idols, and even sacrificed their sons whom they bore to Me, passing them through the fire, to devour them. - Ezekiel 23:37
http://www.biblegateway.com/passage/?search=Ezekiel23:37&version=NKJV
And he defiled Topheth, which is in the Valley of the Son of Hinnom, that no man might make his son or his daughter pass through the fire to Molech. - 2 Kings 23:10
http://www.biblegateway.com/passage/?search=2Kings23:10&version=NKJV
“You shall not murder. - Exodus 20:13
http://www.biblegateway.com/passage/?search=Exodus20:13&version=NKJV
He said to Him, “Which ones?” Jesus said, “‘You shall not murder,’ ‘You shall not commit adultery,’ ‘You shall not steal,’ ‘You shall not bear false witness,’ - Matthew 19:18
http://www.biblegateway.com/passage/?search=Matthew19:18&version=NKJV
Crime of Killing the Unborn is Murder:
“If men fight, and hurt a woman with child, so that she gives birth prematurely, yet no harm follows, he shall surely be punished accordingly as the woman’s husband imposes on him; and he shall pay as the judges determine.But if any harm follows, then you shall give life for life,eye for eye, tooth for tooth, hand for hand, foot for foot,burn for burn, wound for wound, stripe for stripe. - Exodus 21:22-25
http://www.biblegateway.com/passage/?search=Exodus21:22-25&version=NKJV
The Fetus Has Feelings:
For indeed, as soon as the voice of your greeting sounded in my ears, the babe leaped in my womb for joy. - Luke 1:44
http://www.biblegateway.com/passage/?search=Luke1:44&version=NKJV
The "Breath of Life" and Life in the Blood:
And the Lord God formed man of the dust of the ground, and breathed into his nostrils the breath of life; and man became a living being. - Genesis 2:7
http://www.biblegateway.com/passage/?search=Genesis2:7&version=NKJV
For the life of the flesh is in the blood, and I have given it to you upon the altar to make atonement for your souls; for it is the blood that makes atonement for the soul.’ - Leviticus 17:11
http://www.biblegateway.com/passage/?search=Leviticus17:11&version=NKJV
Do not "sin against innocent blood" - 1 Samuel 19:5
http://www.biblegateway.com/passage/?search=1Samuel19:5&version=NKJV
Judging with Righteous Judgment:
Simon answered and said, “I suppose the one whom he forgave more.” And He said to him, “You have rightly judged.” - Luke 7:43
http://www.biblegateway.com/passage/?search=Luke7:43&version=NKJV
Do not judge according to appearance, but judge with righteous judgment.” - John 7:24
http://www.biblegateway.com/passage/?search=John7:24&version=NKJV
Hypocrites! You can discern the face of the sky and of the earth, but how is it you do not discern this time?“Yes, and why, even of yourselves, do you not judge what is right? - Luke 12:56-57
http://www.biblegateway.com/passage/?search=Luke12:56-57&version=NKJV
Hypocrite! First remove the plank from your own eye, and then you will see clearly to remove the speck from your brother’s eye. - Matthew 7:5
http://www.biblegateway.com/passage/?search=Matthew7:5&version=NKJV
Do you not know that the saints will judge the world? And if the world will be judged by you, are you unworthy to judge the smallest matters?Do you not know that we shall judge angels? How much more, things that pertain to this life? - 1 Corinthians 6:2-3
http://www.biblegateway.com/passage/?search=1Corinthians6:2-3&version=NKJV
But those who rebuke the wicked will have delight, And a good blessing will come upon them. - Proverbs 24:25
http://www.biblegateway.com/passage/?search=Proverbs24:25&version=NKJV
Open your mouth for the speechless, In the cause of all who are appointed to die.Open your mouth, judge righteously, And plead the cause of the poor and needy. - Proverbs 31:8-9
http://www.biblegateway.com/passage/?search=Proverbs31:8-9&version=NKJV
But he who is spiritual judges all things, yet he himself is rightly judged by no one.For “who has known the mind of the L ord that he may instruct Him?” But we have the mind of Christ. - 1 Corinthians 2:15-16
http://www.biblegateway.com/passage/?search=1Corinthians2:15-16&version=NKJV
Kids Especially Loved by God:
“Before I formed you in the womb I knew you; Before you were born I sanctified you; I ordained you a prophet to the nations.” - Jeremiah 1:5
http://www.biblegateway.com/passage/?search=Jeremiah1:5&version=NKJV
Love Your Neighbor -- Responsibility to Intervene:
Deliver those who are drawn toward death, And hold back those stumbling to the slaughter.If you say, “Surely we did not know this,” Does not He who weighs the hearts consider it? He who keeps your soul, does He not know it? And will He not render to each man according to his deeds? - Proverbs 24:11-12
http://www.biblegateway.com/passage/?search=Proverbs24:11-12&version=NKJV
And the second is like it: ‘You shall love your neighbor as yourself.’ - Matthew 22:39
http://www.biblegateway.com/passage/?search=Matthew22:39&version=NKJV
“And who is my neighbor?” - Luke 10:29
http://www.biblegateway.com/passage/?search=Luke10:29&version=NKJV
“Woe to you, scribes and Pharisees, hypocrites! Because you build the tombs of the prophets and adorn the monuments of the righteous,and say, ‘If we had lived in the days of our fathers, we would not have been partakers with them in the blood of the prophets.’“Therefore you are witnesses against yourselves that you are sons of those who murdered the prophets.Fill up, then, the measure of your fathers’ guilt.Serpents, brood of vipers! How can you escape the condemnation of hell? - Matthew 23:29-33
http://www.biblegateway.com/passage/?search=Matthew23:29-33&version=NKJV
“If anyone is found slain, lying in the field in the land which the Lord your God is giving you to possess, and it is not known who killed him,then your elders and your judges shall go out and measure the distance from the slain man to the surrounding cities.And it shall be that the elders of the city nearest to the slain man will take a heifer which has not been worked and which has not pulled with a yoke.Then they shall answer and say, ‘Our hands have not shed this blood, nor have our eyes seen it.Provide atonement, O Lord, for Your people Israel, whom You have redeemed, and do not lay innocent blood to the charge of Your people Israel.’ And atonement shall be provided on their behalf for the blood.So you shall put away the guilt of innocent blood from among you when you do what is right in the sight of the Lord. - Deuteronomy 21:1-3,7-9
http://www.biblegateway.com/passage/?search=Deuteronomy21:1-3,7-9&version=NKJV
Made in God's Image:
Then God said, “Let Us make man in Our image, according to Our likeness; let them have dominion over the fish of the sea, over the birds of the air, and over the cattle, over all the earth and over every creeping thing that creeps on the earth.” - Genesis 1:26
http://www.biblegateway.com/passage/?search=Genesis1:26&version=NKJV
Pain in Childbirth Resulted from Sin:
To the woman He said: “I will greatly multiply your sorrow and your conception; In pain you shall bring forth children; Your desire shall be for your husband, And he shall rule over you.” - Genesis 3:16
http://www.biblegateway.com/passage/?search=Genesis3:16&version=NKJV
Rights Come from God:
“You shall not murder.“You shall not commit adultery.“You shall not steal.“You shall not bear false witness against your neighbor. - Exodus 20:13-16
http://www.biblegateway.com/passage/?search=Exodus20:13-16&version=NKJV
Then God said, “Let Us make man in Our image, according to Our likeness; let them have dominion over the fish of the sea, over the birds of the air, and over the cattle, over all the earth and over every creeping thing that creeps on the earth.” - Genesis 1:26
http://www.biblegateway.com/passage/?search=Genesis1:26&version=NKJV
The Sanctity of Unborn Life -- Biblical Fetology:
For You formed my inward parts; You covered me in my mother’s womb.I will praise You, for I am fearfully and wonderfully made; Marvelous are Your works, And that my soul knows very well.My frame was not hidden from You, When I was made in secret, And skillfully wrought in the lowest parts of the earth.Your eyes saw my substance, being yet unformed. And in Your book they all were written, The days fashioned for me, When as yet there were none of them. - Psalm 139:13-16
http://www.biblegateway.com/passage/?search=Psalm139:13-16&version=NKJV
“Before I formed you in the womb I knew you; Before you were born I sanctified you; I ordained you a prophet to the nations.” - Jeremiah 1:5
http://www.biblegateway.com/passage/?search=Jeremiah1:5&version=NKJV
Science, Morality, and Philosophy:
God gave to mankind "the work of the law written in their hearts, their conscience also bearing witness" - Romans 2:15
http://www.biblegateway.com/passage/?search=Romans2:15&version=NKJV
States Rights and Abortion:
Now therefore, deliver up the men, the perverted men who are in Gibeah, that we may put them to death and remove the evil from Israel!” But the children of Benjamin would not listen to the voice of their brethren, the children of Israel. - Judges 20:13
http://www.biblegateway.com/passage/?search=Judges20:13&version=NKJV
Vigilante Behavior Condemned:
But Jesus said to him, “Put your sword in its place, for all who take the sword will perish by the sword. - Matthew 26:52
http://www.biblegateway.com/passage/?search=Matthew26:52&version=NKJV
Beware of Wolves in Sheep's Clothing:
“Beware of false prophets, who come to you in sheep’s clothing, but inwardly they are ravenous wolves. - Matthew 7:15
http://www.biblegateway.com/passage/?search=Matthew7:15&version=NKJV
(If you need explanations on the above verses, or just want clarification on them, see the above linked site.)